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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8cfe8c8ae31fb6f748d0eee1c50ecb6c6b65095be3fd94f0257e9e810dcbd9' 
  AND token = 'crqzch/U3KphzYVGa5jfMAIH3CYpDzsuxtch3mKfr4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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