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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f472ff2aea7c2afb8e66a74d2baf4e7504f068bb4aec66470e8dc9dbdf4a128' 
  AND token = 'Pwf9iGr1ylIgQzggtEhV7T2LyZ/03R9x0zm7pXoKSvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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