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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6410e0fcda0ddc7c47a3e1305eae2958d7623bc6798a39aa2451d3cffd8298' 
  AND token = '2n8+8YN+dZFqeUWAb2bt59QFaMP4m4j38I9TwO/Gz40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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