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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c5c0e29f15b5733d3e7c7829bab53919392a2d208e102871d2a74e5d0f5bf1' 
  AND token = '0D6jOtlf/7ety8ASMw+MFNjDRoTFndLRZJQmexAqcTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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