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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e288727a771e81b86ec2fbf7702aac533a9b93c687fc025e660855075f00102' 
  AND token = 'hbbujL/SV7uYa5mYOh8e/VDHl7ozDvn3YSYo95iHHS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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