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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be99ba754910fc18aee742deef44520a2e77549c1fd8d469a236b602ea5f4dde' 
  AND token = 'XnbCu1gSum8s3rXcjLU8OTYDz7U3Zp0fV4ttCDbgZIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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