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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cec75046ec05f3b5ae0e4652e9803683629fd4d1e3590818a205dc1f1b1da9e' 
  AND token = '9sajycrAbLgWxZSf6xvh3FguVcVPJrXHu4rb5NLBx7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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