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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cf84c0ec97572f0c2950fe5ed99e4424b787f52d4b6c5d3131f6ad5094783a' 
  AND token = 'orAnIajb7iLiYh0x7P98a5PSD64Tw+DqUxR1961uX1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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