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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6000a8b42a377902b88ec29e085002b634ef7fda69b5be589d2bac6ffc54cb60' 
  AND token = '0EeCpfCs6+p5L1E9M98tYFLaB49pJplBVp0xzdFrzOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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