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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9202193b3c20a3eef18b7e491368f83f81e8cafedf488c24cc1227734c9008a' 
  AND token = 'aeL61Z2AsmVLb+jaJucSNXEeuh/70YMhlknFI/AoCyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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