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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bb346a5f0fe8dd0d3eccf7cad927e5fb165b09aa10f04b49abb0abefa9e9ae' 
  AND token = 'JvJrEKNRbg6rDZMbZCeZGzo5Vg1z5AMZCGYcpfcLkNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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