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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3296cc154b4e547b51294715987edf0e852ca437081d18c81f2ed1d0ba1943' 
  AND token = 'dC0BL0qgO196AABmeb/7YeC1DtBWU3FMt+xCk9XJyMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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