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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc27b5628eeb8d176e845a118e9dbdeb0c5e04ae29293a82e124960c0cdc69f' 
  AND token = 'oxfWOhbYJ0KvUWJGAMS7nuIlm4Ai015FWDfjBPyVyAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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