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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bd3b63e5ebab4047ba25e868dee0fd1651357705be910e56ba77363ce7ff62' 
  AND token = 'gdMPwTALpcF0dot95qVFnXsFoG0m8peNVFu42N+YoTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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