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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e667856674a249e7a1cf8e55a3f7424b116a8e49467880729d6391581bafd3b2' 
  AND token = '6id9yfoy27quc208t0159YNgZxi0stJoA7V/BU4oV+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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