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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e919d34514d24260b7c3ae05a28fac459fd00b69044e30ef0e4bd223ce1172a7' 
  AND token = 'b7y5DlXMfAtoAnLC+2qresecStjQjgG9DTit1fmcZGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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