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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50cf604380fa9ecc08f61339224ff576e0d0efe7b38748b6ba7f81ce0ca6e22' 
  AND token = 'b89McmSYvQv8lvkWVdt7YajUik68VkWCS9/DNq9p+HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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