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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8184a1bc9ac2047faf6a933152d763d15343ce7882292ddcfd2fb990c88978f7' 
  AND token = '8vl88c+JIMbVAXh2Lseyp0/pwJ5cvpa9lvEEfJOrc1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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