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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed4d19e6d05e17c9fb5cff5da054afd8069dd632f2f16ee54a499cd6b31fda3' 
  AND token = 'EE+lAPxTo9mXIJZ9hicYB+K1Ws78yMevhP0p+4M/E5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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