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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfb3036bfb88ddfff44d0cbff3859bf4d2558ca986045e15b902f88b6fb56c8' 
  AND token = 'P6JJRAQTR6Utwn9FsJ5wDKUnNuNTynbPz/KDh34djfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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