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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5084377bb9f3c4beb3db9f5e029c4a4da97cfe549485bce6f4ac30c64c86878' 
  AND token = 'GrKv4RzAXbj5451UY4Hn3v9qD3NspUmZnX2WHE4eFEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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