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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06a5fd16289cd9e0f413eec555fbf82b40387f46bfe52e5eb8f14ccaee25685' 
  AND token = 'SIGvj15YE3EGpHtKu3bo8DR7U+ZPLzlriY/z3ijTKWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}