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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9534b6ea77cc2c4c676d4382f020409a2061b21e8b2e5723f1b7acf04371389' 
  AND token = 'CZAi1fz4ePv4TQ2yuAgTPbqbebyaLiNN4rnFQlv45yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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