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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a3f54b337c9d5c3bad54167a2010e4d217af01dbf19c51f75e29768b7c8260' 
  AND token = 'PoYq4dpRihCxf7mWLdDd4YMq1N7Z9U9ySdHItOZ28PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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