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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031d330955bc6ff809e3bfd0bb82ed6358e04b48ea37f9c382d30d5c24295b75' 
  AND token = 'I5+mnyrxajy55/Wxrg9o/snzxRSfnrdzgUEfhYsP5lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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