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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502e86a3a623f674ec9f16488def8a0190db9b0ee52c2cec09f3343dad5223dd' 
  AND token = 'HO/nKQbvtuLb6FCaGAKTffjALWdO0VrVP2ecVh98kzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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