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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee275bc027f3994296a05e1395247cdbcbc87fba4d9bb582e673b1f3e9dd1414' 
  AND token = 'ocktL3Nvbuodv0r+V2OR4huS7dpRwtpnGYb3XvT+YGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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