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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23942610f4745be41ef31ec31256d36641e653e7efe7331023045e4eaccf2907' 
  AND token = 'IUfBDuSHe742YCNJPtL8ZT6LzuZNxNXf0wS1cYnK5cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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