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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5196cff1cc8649fe7431da7c934fe5833252e69febf44ab4a0b5e35c9fdb1b' 
  AND token = 'y2wh9qzXbV2hSbVDestNggTqlunJO41ci3h1UGFOcAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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