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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6745e0bc8a8040f5b27ac402c0939c1dc578c8cb8d5de1b5fcb51307286fac4c' 
  AND token = 'p7gQB9X2OxRdBu2SValeiK9uas81Xgdl49f4rW7zX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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