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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c1bd5fe0d892bc8caf166f65ccf476655c928e62f0b584c489bbd9e1655316' 
  AND token = 'F8WpyAVKAfEATPYQO+1/QLcd0TFHUM/jR52pvetCCbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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