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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1d4753b215ffeb19ec8d100ba5a38d56b803395600c72458800495a17d8ea1' 
  AND token = 'N8E1DOFJW3xvYxZSBVy6hp8eviK3bqc67x4aE1CYhSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00154

JSON explain

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