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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec3c973393f2504e81a4a9727b10bd2f22dfd4bdeae67efa191d80c3d04f0f7' 
  AND token = '5Tlu6chrsKLGDN3aIKaPTWhc/TLIYQCrcDpwHH5bWeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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