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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aa316d1c679dbd4c06aef146422b8fda51b9b5494ee776189a0be16f727987' 
  AND token = '7MqvFlKFPCuqLjzZnKMADQCeSAsagR3DDM2t5Q7jmmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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