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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937855461542b0bd85b322549fd470459b4fc79a13a2a55c89c5cc088161d60e' 
  AND token = 'eAVyaLZi/G7/DukLlFGSTPsbBi657RS9uf4kOiXyg/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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