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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2e02cbac0010a20d22215c464f3427379a9cbd7c4422af98c00c3a4a777410' 
  AND token = 'wQzk7/cjNpSM0AOftG9294ruj7l38SDarJdrj81oAVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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