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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f171e68ac95ef20d9e88ee48fa50de9a5b547cb9bc56e83f70290a1d6856abe8' 
  AND token = 'IjeAtt+IpVvG0f/pv9qKA7ZO52qIHy1z9VOJU6OGQ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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